Extrusion head for extruding a high viscous melting covering element of a covered core wire

Abstract

There is provided an extrusion head that is capable of largely increasing a production speed rather than a conventional head that extrudes supplies a high viscous melt-coating composition. In an extrusion head 12 that comprises a die ring 12 having an exit portion 122 and a nipple 13 arranged in vicinity of the exit portion 122, whereby a core wire passage 131 is provided to an inside of the nipple 13 in an axial direction, and a high viscous melt-coating composition is pressure-fed into a space, which is formed by the die ring 12 and the nipple 13, toward the exit portion 122 while drawing out a core wire W from the core wire passage to the exit portion, and thus a cord-like coated core wire is extruded from the exit portion 122 of the die ring while coating the core wire W with the high viscous melt-coating composition, a stagnation reservoir of the high viscous melt-coating composition is provided in vicinity of the exit portion by providing a wall surface 121 perpendicularly to a proceeding direction of the core wire W at the exit portion 122.

Dependencies are inferred from the claim text.